Photographic shutter.



No. 764,375. I 4 PATENTED JULY 5, 1904. j M. A. RICHTER. PHOTOGRAPHIG SHUTTER.

APPLICATION FILED MAR. 20, 1903. N0 MODEL.

UNITED STATES Patented July 5, 1904.

PATENT OFFICE.

MAX ADELBERT RICHTER, OF DRESDEN, GERMANY, ASSIGNOR TO HEINRICH ERNEMANN AKTIEN-GESELLSCHAFT FUR CAMERA- FABRIKATION 1N DRESDEN, OF DRESDEN, GERMANY.

PHOTOGRAPHIC SHUTTER.

SPECIFICATION forming part of Letters Patent No. 764,375, dated July 5, 1904. Application filed March 20, 1903. Serial No. 148,759. (No model.)

To (LI/Z whom, it may concern.-

Be it known that 1, MAX ADELBERT RIoH-" which the width of the slot can be adjusted from the outside in the following manner:

.The edge of one half-blind is provided with bands or strings passing through eyes on the edge of the second half-blind, which cords or strings are secured to pulleys arranged at both ends of the roller for the first half-blind in such manner that when the shutter is working they' rotate together with the roller; but when the width of the slot is being adjusted they are turned relatively to the roller, which remains stationary. This invention refers particularly to such a shutter in which the common spindle of the roller and of the two pulleys is at the same time used for adjusting the pulleys from the outside after they have been uncoupled from the roller by being moved in longitudinal direction.

As in the shutter accordlng to this invention the roller arranged between the pulleys has no handle projecting outside by means of Which it could be held fast during the adjustment of the pulleys, the spindle of the roller uncoupled must be fixed during the adjustment in some other way. This is one of the objects of this invention and is attained by a part which is non-rotatable and which is connected with the longitudinally-movable spin-- and engaging with the holes or notches in the said disk.

The invention further relates to a device for:

indicating the width of the slot, which is moved together with the pulleys, but is not affected by the rotation of the spindle during the working of the shutter. For this purpose the movable spindle is provided with an absolutely fixed pinion permanently engaging with a dial or with a toothed wheel connected to a pointer, but which is coupled to the spindle only when the latter is moved longitudinally, whereby the roller is uncoupled.

The invention finally relates to means for uncoupling the winding device from the spindle during the adjustment of the pulleys, so that the spindle can be rotated in either direc- .tion.

A roller-blind shutter according to this invention is illustrated in the accompanying drawings, in which Figure 1 is an elevation partly in section. Figs. 2 and 3 are respectively left and right hand end views. Fig. at shows separately, on an enlarged scale, the perforated disk on the spindle; and Figs. 5 and 6 show in longitudinal and cross section the left-hand end of the spindle with the coupling for the pinion of the indicator.

The upper half 1 of the blind is secured to the rollerQ and provided at its free edge with a wire stiffening 3. The lower half of the blind is secured at one end to a roller 5, provided in the usual manner with a spring for the purpose of rolling up the blind made in two halves after the shutter has been released. Bands 6 pass through eyes 7 in a corresponding wire stifi'ening of the half-blind 4L through the eyes 3 to pulleys 8, to which they are socured. The left-hand pulley 8 engages, by means of a cylindrical extension 9, with the left-hand end of the roller 2. The spindle 11, which is movable longitudinally against the action of a spring 10 within the roller, is provided with two spring-keys 12, by means of which the pulleys 8 can be caused to participate in the rotation of the spindle in any position. The right-hand spring-key causes, as long as the spindle is in its left-hand position, (shown in the drawings,) the roller 2 to participate in the rotation; but when the spindle is shifted to the right said key becomes disengaged from the end of the roller 2, so that the roller becomes uncoupled and only the pulleys are rotated when the spindle is turned.

The shifting of the spindle 11 is effected by pressing on a knob 13, and the spindle is rotated by turning the knob 14:. In order to secure the uncoupled roller 2 in its position during the adjustment of the pulleys 8, a disk 15 is secured to the left-hand end of the roller. As shown in Fig. 4:, the disk 15 is provided with a number of small holes in a circle, which could also be replaced by notches, so as to give the disk an appearance of a toothed wheel. When the spindle 11 is moved to the right, a pin 16, connected to the spindle by means of a fork 17 engaging in a circular groove in the knob 13, Fig. 6, enters one of the holes or notches of the disk. When the blind 1 is rolled up, the wire 3 engages with the recess 18, Fig. 4:, of the disk 15, so that the blind 1 can be wound up uniformly in spite of the disk 15. When the roller 2 is fixed in the described manner, bymoving the spindle 11 to the right the spindle may be rotated with the fingers of the right hand in either direction by means of the knob 14: in order to alter the width of the slot by rolling up or unrolling the bands. During this operation a finger of the left hand presses on the knob 13 in order to maintain the spindlell in its right-hand position. As soon as this finger is removed the spring 10 causes the spindle 11 to return to its left-hand position, and the roller 2 is again coupled to the spindle by means of the springkey 12. As during this operation a toothed wheel 20 of the well-known winding device engages with the fixed pinion 19, which is also connected with the movable spindle by means of a spring-key, and a pawl 22 engages with a ratchet-wheel 21 on the spindle of the wheel 20, the spindle 11 can turn only in one direction. In order to enable it to be rotated in the other direction, the pawl 22 must be disengaged. This is effected bymeans of a bell-crank lever 23 2 1, the arm 23 of which drops off the neck of the knob 14: when the spindle is shifted to the right and approaches toward the axis of the spindle 11, the arm 24. thereupon disengaging the pawl 22 by engaging with a pin 25 thereon. On the bell-crank acts a strong spring 26, which overcomes the weaker spring 27 of the pawl 22. When the spindle 11 returns to the left-hand side, the arm 23 rises again, its beveled surface riding upon the enlarged part of the spindle, Fig. 1.

The slot-width indicator could be constituted by a hand moving over a dial. It is, however, preferable to have it made in the form of a disk 28, indicating the width of slot in millimeters or fractions of an inch, said disk rotating behind a plate 30, provided with an annular slot 29. A gear-wheel 31 engages with the toothed edge of the disk 28. The

wheel 31 is mounted on the spindle 11 by means of a spring-sleeve 32, provided with longitudinal slots. The gear-wheel and sleeve are fixed together and are coupled with the spindle 11 when the latter is moved to the right, the conical bore in the knob 13, Fig. 6, compressing the slotted sleeve and pressing it against the spindle, so as to make a frictional engagement. The indicator device is therefore rotated only when the spindle 11, with the pulleys,is rotated after having been moved to the right, while during the ordinary working of the shutter the indicator remains in the position indicating the width of the slot effected at the last adjustment. In order to prevent accidental turning of the disk 28, it is provided with a spring-brake 33. The friction-coupling constituted by the conical bore of the knob 13 and the slotted sleeve 32 may be replaced by some other coupling.

What I claim as my invention, and desire to secure by Letters Patent, is

1. In a roller-blind shutter, the combination with the shutter-sections, of the spring-roll,the winding-roll, the shaft upon which the roll is loosely mounted, means for locking the shaft and roll together, the pulleys fast on the shaft, flexible connections extending from each pulley to the shutter-sections, and means for simultaneously locking the winding-roll from turning when unlocked from its shaft; substantially as described.

2. In a roller-blind shutter, the combination with the shuttersections,of the spring-roll,the winding-roll,the shaft movable longitudinally in the roll, the spring-keys for locking the shaft and roller, the pulleys fast on the shaft, flexible connections extending from the pulleys to the shutter-sections, the plate fast on said shaft, the pin carried by the shaft and adapted to engage said disk to lock the roll from turning when the shaft is moved to uncouple the winding-roller from its shaft; substantially as described.

3. In a roller-blind shutter, the combination with the shutter-sections, of the spring-roll, the winding-roll, the shaft movable longitudinally within the roll, the spring-keys for locking the roll and shaft, the pulleys fast on the shaft, flexible connections extending from the pulleys to the shutter-sections, the disk on the shaft provided with a series of perforations, the fork carried by the shaft, the pin on the fork, adapted to engage with the perforations in the disk, whereby when the shaft is moved, the roller will be uncoupled from the shaft and simultaneously locked from rotation; substantially as described 4. In a device such as described, and in combination with the blind-winding mechanism, of the spindle of the winding-roll, the pawl for permitting the rotation of the spindle 1n but one direction, and means for disengaging the pawl when the spindle is moved to uncouple the winding-roll; substantially as described.

55. In a device such as described and in com-.

bination with the blind-winding mechanism,

IIO

the spindle of the winding-roll movable within the roll, the pawl'for locking the winding mechanism, the spring-pressed bell-crank lever adapted to engage the pawl to release the winding mechanism, normally held out of operative position, but adapted to be tripped by the movement of thewinding-roll spindle; substantially as described.

6. In a device such as described, the combination with the winding-roll spindle, having a projection thereon, of the winding mechanism, the pawl for locking said mechanism, the spring-pressed bell-crank lever adapted to engage said pawl to release the winding mechanism, one arm of the bell-crank lever normally resting on the projection on the spindle, whereby the lever will be held out of operative position, but adapted to be thrown into operative position when the spindle is moved to withdraw the projection; substantially as described.

-7. In a roller-blind shutter, the combination I with the shutter-sections, of the winding-roll and spindle movable therein, an indicator for showing the width of opening between the 5 shutter-sections, mechanism for operating the indicator adapted to be operatively connected with the winding-roll spindle, only when said spindle is moved to uncouple the spindle and winding-roll; substantially as described.

8. In a roller-blind shutter, the combination with the shutter-sections, of the winding-roll and spindle movable therein, an indicator, a compressible sleeve mounted on the spindle and carrying a gear-wheel for operating the 35 indicator, a knob carried by the spindle formed with a conical bore fitting over the sleeve, whereby when the spindle is moved to uncouple the roll, said sleevewill be compressed on the spindle and'the spindle and 4 indicator coupled; substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

MAX ADELBERT RICHTER.

I/Vitnessesz KARL GREIERT, OTTO WVoLF. 

